ABB RET670 Installation And Commissioning Manual page 129

1MRK 504 088-UEN C
Installation and commissioning manual
4
X1
50% RLdFw
IEC09000735 V2 EN
Figure 55: Operating characteristic for phase selection function, forward
direction phase-to-phase faults
Table 22: Test points for phase-earth loop L3-E (Ohm/loop)
Test point Value
1 X [X1+XN]
R 0
2 X 0
R RLdFw
3 X 0.85·[X1+XN]
R 0.85·[X1+XN]·1/tan(60°)+RFFwPE
4 X 0.85·[X1+XN]
R -0.85·[X1+XN]·
tan (AngNegRes-90°)
5 X RFFwPE·tan (ArgLd)
R RFFwPE
6 X -0.5·RLdFw·tan (ArgDir)
R 0.5·RLdFw
The table showing test points for phase-to- earth loops is used together with figure
54.
Verifying settings by secondary injection
W
( / phase )
X
1
85%
5
ArgNegRes
2
7
6 ArgDir
0.5·RFFwPP
Section 13
3
ArgLd
60°
W
( / phase
R
IEC09000735-2-en.vsd
Comments
XN=(X -X )/3
0 1
R≈0.491·(X1+XN)+RFFwPE
)
123